“reduced anxiety in GF animals is also normalised following restoration of the intestinal microbiota. These results demonstrate that CNS neurotransmission can be profoundly disturbed by the absence of a normal gut microbiota and that this aberrant neurochemical, but not behavioural, profile is resistant to restoration of a normal gut flora in later life.”

The microbiome-gut-brain axis during early life regulates the hippocampal serotonergic system in a sex-dependent manner. – PubMed – NCBI
http://jhavelikes.tumblr.com/post/182788124405

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